Composition and ink receiving system incorporating the composition

ABSTRACT

A composition includes an alkenyl succinic anhydride sizing agent or an alkyl ketene dimer sizing agent. The alkenyl succinic anhydride sizing agent is present in an amount ranging from about 1.0 pounds per ton to about 4.0 pounds per ton. The alkyl ketene dimer sizing agent is present in an amount ranging from about 2.0 pounds per ton to about 10.0 pounds per ton. A metallic salt is also incorporated in the composition.

BACKGROUND

The present disclosure relates generally to ink systems, and moreparticularly to ink receiving systems.

There is a variety of ink receiving systems that are suitable for usewith inkjet printing. When combined with inkjet printing, some of thesesystems are capable of providing relatively fast dry times for blackinks, and other systems are capable of producing bold, sharp printedtext and high optical density. Some systems that are designed to providefaster black ink dry times may, in some instances, result in lesserquality printed text and lower optical density. Further, some systemsdesigned to provide higher quality text and high optical density may, insome instances, result in slower black ink dry times.

Furthermore, there are a variety of ink sets that are suitable for usewith a variety of ink receiving systems. Some of the ink sets arecapable of providing a large color gamut on plain paper, and other ofthe ink sets are capable of providing superior resistance to lightfading on photo paper. Some ink sets that are designed to provide alarge color gamut on plain paper may, in some instances, result in lowerfade resistance. Further, some ink sets designed to provide higher faderesistance may, in some instances, provide lower color gamut on plainpaper.

As such, it would be desirable to provide an ink receiving system thatis capable of achieving relatively fast black ink dry times whileresulting in bold, sharp printed text and high optical density. It wouldalso be desirable to provide an ink receiving system that is capable ofachieving high color gamut with an ink set having superior lightresistance.

SUMMARY

A composition includes an alkenyl succinic anhydride internal sizingagent or an alkyl ketene dimer internal sizing agent. The alkenylsuccinic anhydride internal sizing agent is present in an amount rangingfrom about 1.0 pounds per ton to about 4.0 pounds per ton. The alkylketene dimer internal sizing agent is present in an amount ranging fromabout 2.0 pounds per ton to about 10.0 pounds per ton. A metallic saltis also incorporated in the composition.

DETAILED DESCRIPTION

The embodiment(s) of the ink receiving system may advantageously be usedwith a variety of printing techniques, including, but not limited toinkjet printing and dry electrophotographic printing. Without beingbound to any theory, it is believed that the systems may advantageouslyprovide relatively fast dry times without compromising the quality ofthe printed images. Still further, a lightfast pigment based colorantmay be used on a variety of media (e.g. plain paper or photopaper), eachof which includes embodiment(s) of the composition disclosed herein. Itis believed that the inclusion of embodiment(s) of the composition(s)allows the achievement of a desirable color gamut, as well as adesirable fade resistance.

An embodiment of the ink receiving system includes a substrate having acomposition therein. It is to be understood that any substrate may beselected that is suitable for having indicia (e.g. alphanumeric indiciaand/or graphical indicia) printed thereon. In an embodiment, thesubstrate is paper (non-limitative examples of which include plain copypaper or papers having recycled fibers therein) or photopaper(non-limitative examples of which include polyethylene or polypropyleneextruded on one or both sides of paper), and/or combinations thereof. Inan embodiment, the substrate has a thickness along substantially theentire length ranging between about 0.025 mm and about 0.5 mm.

As used herein, the term “composition” includes ingredients that may beincorporated in the substrate substantially simultaneously,sequentially, and/or at different times. For example, the ingredientsmay be added during wet end processing, during size press processing,and/or during off-line coating processing when the substrate is paper.

The composition has one of two different types of internal sizingagents. In an embodiment, the sizing agent is an alkenyl succinicanhydride (ASA) internal sizing agent, and in another embodiment, thesizing agent is an alkyl ketene dimer (AKD) internal sizing agent.

When the alkenyl succinic anhydride internal sizing agent is used, it ispresent in the composition in an amount ranging from about 1.0 poundsper ton (about 0.05%) to about 4.0 pounds per ton (about 0.20%). In anon-limitative example in which the ASA is used in plain paper, the ASAis present in an amount ranging from about 1.0 pounds per ton (about0.05%) to about 3.0 pounds per ton (about 0.15%). In still anothernon-limitative example in which the ASA is used in plain paper, the ASAis present in an amount ranging from about 1.2 pounds per ton (about0.06%) to about 1.8 pounds per ton (about 0.09%). In an alternatenon-limitative example in which the ASA is used in paper having recycledfibers (e.g. greater than about 20% recycled fibers), the ASA may bepresent in a higher amount, for example in an amount ranging from about3.0 pounds per ton (about 0.15%) to about 4.0 pounds per ton (about0.20%).

When the alkyl ketene dimer sizing (AKD) agent is used, it is present inthe composition in an amount ranging from about 2.0 pounds per ton(about 0.10%) to about 10.0 pounds per ton (about 0.50%). In analternate embodiment, the AKD may be present in the composition in anamount ranging from about 2.0 pounds per ton (about 0.10%) to about 7.0pounds per ton (about 0.35%).

In another embodiment, the composition contains both ASA and AKDinternal sizing agents. In a non-limitative example of this embodiment,the range of total sizing agent is from about 1.0 lb/ton to about 10.0lbs/ton.

Without being bound to any theory, it is believed that the range ofinternal sizing agent in composition(s) of the present embodiment(s) mayallow the substrate to be used with lightfast colorants (e.g. pigmentbased inks) substantially without compromising a desirable color gamutand without compromising desirable fade resistance.

The composition may also vary the total sizing of the substrate. In anembodiment, the composition provides the substrate with a total sizingof less than about 70 as measured by the Hercules Sizing Test. Inanother embodiment, the composition provides the substrate with a totalsizing of less than about 30 as measured by the Hercules Sizing Test.Embodiments of the system or substrate having the relatively low (lessthan about 70) total sizing are relatively absorptive and allow forrelatively fast drying times.

The internal sizing agent of the composition is incorporated into thesubstrate. In an embodiment, the internal sizing agent is incorporatedduring the manufacture of the substrate in the wet end process ofpapermaking. It is to be understood that the sizing agent may be solublein an aqueous medium (e.g. water). The sizing agent may be soluble inthe aqueous medium at a pH ranging from about 4 to about 10. In anon-limitative example, the sizing agent is soluble at a pH ranging fromabout 4 to about 6.5. In still another non-limitative example, thesizing agent is soluble at a pH ranging from about 9.5 to about 10.

The composition also includes a metallic salt. The metallic salt may beincorporated in the substrate via the wet end operation and/or the sizepress process. As such, the metallic salt may be dispersed in thesubstrate with the sizing agent and/or may be added separately from thesizing agent. In an embodiment where a surface sizing agent (describedfurther hereinbelow) is added, it is to be understood that the metallicsalt may be added to the substrate with the surface sizing agent.Non-limitative examples of the metallic salt include calcium chloride,magnesium chloride, aluminum chloride, beryllium chloride, calciumnitrate, magnesium nitrate, aluminum nitrate, beryllium nitrate and/orcombinations thereof. Without being bound to any theory, it is believedthat the metallic salt advantageously assists in immobilizing pigment ordye that is printed on the substrate relatively quickly, thereby keepingthe ink near the substrate surface and substantially preventing thecolorant from penetrating or spreading (wicking, smearing).

It is to be understood that the metallic salt may be soluble in a medium(e.g. water) at a pH ranging from about 4 to about 10. In anon-limitative example, the metallic salt is soluble at a pH rangingfrom about 4 to about 6.5. In still another non-limitative example, themetallic salt is soluble at a pH ranging from about 9.5 to about 10.

In an embodiment, the system also includes a surface sizing agent in thesubstrate. The surface sizing agent is added to the substrate via thesize press operation in the manufacturing process of paper. It is to beunderstood that the surface sizing agent may be soluble in an aqueousmedium (e.g. water). In an embodiment, anionic starch is used as asurface sizing agent and is incorporated in at the size press. It is tobe understood that anionic starch may be used in conjunction with morehydrophobic sizing agents to assist in controlling overall sizing, asmeasured, for example via the Hercules Sizing Test (HST). Non-limitativeexamples of other suitable surface sizing agents include corn starch,modified starches (non-limitative examples of which include ethylatedstarches or cationic starches), styrene based emulsion polymers, AKD,and/or combinations thereof. It is to be understood that the amount ofstarch-based surface sizing agent in the system generally ranges fromabout 30 lbs/ton to about 150 lbs/ton. It is to be further understoodthat the amount of emulsion polymer or AKD surface sizing agent in thesystem generally ranges from about 0 lbs/ton to about 6 lbs/ton.

It is to be understood that the system(s) disclosed herein may be usedwith a variety of printing techniques (non-limitative examples of whichinclude inkjet printing and dry electrophotographic printing) and avariety of inks (non-limitative examples of which include dye based inksand color pigment based inks). It is to be further understood that inkmay be preferentially jetted from the printer onto the system inresponse to signals received by the printer.

In a non-limitative example where indicia are formed on the system withblack pigment ink having a binder therein, the indicia havesubstantially increased optical density and substantially decreaseddrytime.

In another non-limitative example where indicia are formed on the systemwith pigmented ink, the indicia have substantially increasedlightfastness and substantially increased color gamut. In one embodimentof the system disclosed herein, pigment based color ink sets, as opposedto dye based color ink sets, may be used to achieve enhancedlightfastness and color gamut. One non-limitative example of a colorantin the color pigmented ink includes yellow colorant having a blue woolscale greater than about 7. In a further non-limitative embodiment, thecolor pigmented ink is selected from the disazo yellow pigment class,the bis-acetoacetarylide yellow pigment class, and combinations thereof.Yellow ink 93 and yellow ink 128 generally belong to the disazo yellowpigment class, while yellow ink 155 generally belongs to thebis-acetoacetarylide yellow pigment class. Generally, color pigmentedinks provide relatively good fade resistance on photopaper, however,such inks may not be suitable for plain paper as the color gamut isrelatively poor. Plain paper including embodiments of the compositiondisclosed herein may receive color pigment inks and may achieve a goodcolor gamut when compared to the color gamut achieved on plain paper. Assuch, it is believed that lightfast, low strength colorants may be usedwith the ink receiving system disclosed herein, as the systemadvantageously improves the color gamut of these inks on plain paper andmaintains the fade resistance on photo paper.

Without being bound to any theory, it is believed that the combinationsof the disclosed system and the respective inks (e.g. black pigment ink,color pigment ink) result in the increased optical density,lightfastness, and/or color gamut. In addition to these advantages, thesystem may also provide relatively fast dry times.

Still further, embodiment(s) of the system may advantageously haveincreased saturation and chroma when compared to non-treated substrates.In a non-limitative example in which non-treated paper is compared to anembodiment of the system described herein, red saturation increases fromabout 0.91 (non-treated paper) to about 1.24 (system disclosed herein),and red chroma increases from about 52.4 (non-treated paper) to about65.5 (system disclosed herein).

To further illustrate embodiment(s) of the present disclosure, thefollowing examples are given. It is to be understood that these examplesare provided for illustrative purposes and are not to be construed aslimiting the scope of embodiment(s) of the present disclosure.

EXAMPLE 1

Various yellow inks were printed on different plain papers, the first(i.e. plain paper 1) of which included an embodiment of the compositiondescribed herein. Plain paper 1 included about 1.8 lb/ton of alkenylsuccinic anhydride sizing agent and about 20-23 lb/ton of calciumchloride. Plain paper 1 also had an HST ranging between about 50 andabout 70. Plain paper 2 included about 2.0 lb/ton of alkenyl succinicanhydride sizing agent and no calcium chloride. The HST of plain paper 2was about 150.

The inks were printed using different pens labeled 1-8. The followingchart illustrates the average chroma (C*) value for each of the yellowinks printed from a particular pen. The yellow inks used weredispersions of Pigment Yellow 74, Pigment Yellow 155, Pigment Yellow128, and Pigment Yellow 93. The relatively high C* values for plainpaper 1 indicate that the inks may produce vivid color on plain paperthat includes therein the composition(s) of the present disclosure.TABLE 1 Average C* for Yellow Inks from Respective Pens PY 74 PY 155 PY128 PY 93 1 2 3 4 5 6 7 8 Plain Paper 1 94.97 96.35 89.88 88.02 81.8782.07 91.26 91.07 Plain Paper 2 93.54 94.31 87.33 84.21 78.93 77.5388.05 88.63

Table 2 illustrates the average of the chroma values shown in Table 1for each of the inks. For example, the average for PY 74 on plain paper1 is the average of the chroma values for that ink from pens 1 and 2shown in Table 1. TABLE 2 Average C* for Yellow Inks PY 74 PY 155 PY 128PY 93 Plain Paper 1 95.66 88.95 81.97 91.17 Plain Paper 2 93.92 85.7778.23 88.34

Table 3 illustrates the average lightfastness, in years, for each of theinks. The lightfastness rating of each ink on a specific media wasmeasured under a fluorescent light source. The standard assumption is a12-hour day, 450 lux, 50% relative humidity, and a 35% density losslimit. The media used in Example 1 was a flyer and brochure paperincluding a coating, and the media used in Example 2 was an art paperparticularly suitable for watercolor paints. TABLE 3 Averagelightfastness (years) PY 74 PY 155 PY 128 PY 93 Example 1 65 320 4200406 Example 2 51 196 2290 311

EXAMPLE 2

Plain papers (labeled A-J in Table 4) having different amounts of ASAinternal sizing agent and metallic salt were prepared. Images wereprinted on both the felt side and the wire side of the paper. Adye-based printer (HP Photosmart 8250 Inkjet Printer, available fromHewlett Packard Company, located in Palo Alto, Calif.) was used to printtext on the various papers, and the print quality of the text wastested. A pigment-based printer (HP Deskjet 6122 available from HewlettPackard Company, located in Palo Alto, Calif.) was used to print text onthe various papers, and the black optical density (OD) and thepercentage of ink transferred were tested. TABLE 4 Black OpticalDensity, % Ink Transferred, Text Print Quality ASA Internal Surface TextHST, Size (IS) Size (SS) IS/SS, CaCl2, Black % Ink Print Media Side seclb/ton lb/ton Ratio lb/ton OD Transferred Quality Paper A Felt 103 2 1.31.54 0 1.35 52 2 Paper A Wire — 2 1.3 1.54 0 1.35 58 — Paper B Felt 1231.9 1.9 1.00 20 1.56 32 3 Paper B Wire 129 1.9 1.9 1.00 20 1.56 25 3Paper C Felt 133 1.85 2 0.93 25 1.54 40 3 Paper C Wire 145 1.85 2 0.9325 1.54 32 3 Paper D Felt 123 1.77 2 0.89 25 1.52 28 4 Paper D Wire 1191.77 2 0.89 25 1.52 25 4 Paper E Felt 134 1.7 2 0.85 25 1.54 35 4 PaperE Wire 147 1.7 2 0.85 25 1.54 26 4 Paper F Felt 115 1.6 2 0.8 25 1.47 282 Paper F Wire 133 1.6 2 0.8 25 1.47 23 2 Paper G Felt 52 1.3 2 0.65 201.53 13 1 Paper G Wire 45 1.3 2 0.65 20 1.53 9 1 Paper H Felt 48 1.3 2.50.52 20 1.56 10 1 Paper H Wire 47 1.3 2.5 0.52 20 1.56 11 1 Paper I Felt48 1.3 3 0.43 20 1.55 12 2 Paper I Wire 44 1.3 3 0.43 20 1.55 12 2 PaperJ Felt 21 1.2 1.3 0.92 25 1.56 7 1 Paper J Wire — 1.2 1.3 0.92 25 1.56 6—

Generally, those papers including embodiment(s) of the compositiondisclosed herein (specifically, those having ASA ranging in amounts fromabout 1.2 lbs/ton to about 1.8 lbs/ton) performed suitably in the teststhat were conducted. Papers G, H, I and J exhibit very good percentagesof ink transferred and good print quality. Papers B, D, E, and F exhibitvery good print quality and good percentages of ink transferred.

While several embodiments have been described in detail, it will beapparent to those skilled in the art that the disclosed embodiments maybe modified. Therefore, the foregoing description is to be consideredexemplary rather than limiting.

1. A composition, comprising: an alkenyl succinic anhydride internal sizing agent in an amount ranging from about 1.0 pounds per ton to about 4.0 pounds per ton; and a metallic salt incorporated in the composition.
 2. The composition as defined in claim 1 wherein the composition is adapted to be incorporated into a substrate.
 3. The composition as defined in claim 2 wherein the composition is adapted to provide the substrate with a total sizing less than about 70 as measured by a Hercules Sizing Test.
 4. The composition as defined in claim 2 wherein the substrate is adapted to have indicia formed thereon with color pigmented ink, the indicia having substantially increased lightfastness and substantially increased color gamut.
 5. The composition as defined in claim 4 wherein the substrate is selected from paper, photopaper, and combinations thereof.
 6. The composition as defined in claim 4 wherein the color pigmented ink is selected from a disazo yellow pigment class, a bis-acetoacetarylide yellow pigment class, and combinations thereof.
 7. The composition as defined in claim 4 wherein the color pigmented ink is selected from yellow ink 93, yellow ink 128, yellow ink 155, and combinations thereof.
 8. The composition as defined in claim 2 wherein the composition is adapted to provide the substrate with a total sizing less than about 30 as measured by a Hercules Sizing Test.
 9. The composition as defined in claim 2 wherein the substrate is adapted to have indicia formed thereon with black pigment ink having a binder therein, the indicia having substantially increased optical density and substantially decreased drytime.
 10. The composition as defined in claim 1 wherein the metallic salt is selected from calcium chloride, magnesium chloride, aluminum chloride, beryllium chloride, calcium nitrate, magnesium nitrate, aluminum nitrate, beryllium nitrate, and combinations thereof.
 11. The composition as defined in claim 1 wherein the internal sizing agent and the metallic salt are each soluble in an aqueous medium at a pH ranging from about 4 to about
 10. 12. The composition as defined in claim 11 wherein the internal sizing agent and the metallic salt are each soluble in an aqueous medium at a pH ranging from about 4 to about 6.5.
 13. The composition as defined in claim 1 wherein the alkenyl succinic anhydride internal sizing agent is present in an amount ranging from about 1.2 pounds per ton to about 1.8 pounds per ton.
 14. A composition, comprising: an alkyl ketene dimer internal sizing agent in an amount ranging from about 2.0 pounds per ton to about 10.0 pounds per ton; and a metallic salt incorporated in the composition.
 15. The composition as defined in claim 14 wherein the composition is adapted to be incorporated into a substrate.
 16. The composition as defined in claim 15 wherein the composition is adapted to provide the substrate with a total sizing less than about 70 as measured by a Hercules Sizing Test.
 17. The composition as defined in claim 15 wherein the substrate is adapted to have indicia formed thereon with color pigmented ink, the indicia having substantially increased lightfastness and substantially increased color gamut.
 18. The composition as defined in claim 17 wherein the substrate is selected from paper, photopaper, and combinations thereof.
 19. The composition as defined in claim 17 wherein the color pigmented ink is selected from yellow ink 93, yellow ink 128, yellow ink 155, and combinations thereof.
 20. The composition as defined in claim 15 wherein the composition is adapted to provide the substrate with a total sizing less than about 30 as measured by a Hercules Sizing Test.
 21. The composition as defined in claim 15 wherein the substrate is adapted to have indicia formed thereon with black pigment ink having a binder therein, the indicia having substantially increased optical density.
 22. The composition as defined in claim 14 wherein the metallic salt is selected from calcium chloride, magnesium chloride, aluminum chloride, beryllium chloride, calcium nitrate, magnesium nitrate, aluminum nitrate, beryllium nitrate, and combinations thereof.
 23. The composition as defined in claim 14 wherein the internal sizing agent and the metallic salt are each soluble in an aqueous medium at a pH ranging from about 4 to about
 10. 24. The composition as defined in claim 23 wherein the internal sizing agent and the metallic salt are each soluble in an aqueous medium at a pH ranging from about 9.5 to about
 10. 25. An ink receiving system, comprising: a substrate; an internal sizing agent selected from an alkyl ketene dimer sizing agent and an alkenyl succinic anhydride sizing agent incorporated into the substrate, wherein the alkyl ketene dimer sizing agent is present in an amount ranging from about 2.0 pounds per ton to about 10.0 pounds per ton or the alkenyl succinic anhydride sizing agent is present in an amount ranging from about 1.0 pounds per ton to about 4.0 pounds per ton; and a metallic salt incorporated in the substrate.
 26. The ink receiving system as defined in claim 25 wherein each of the internal sizing agent and the metallic salt is soluble in a medium that is incorporated into the substrate at a pH ranging between about 4 and about
 10. 27. The ink receiving system as defined in claim 25 wherein the substrate is selected from paper, photopaper, and combinations thereof.
 28. The ink receiving system as defined in claim 25 wherein the metallic salt is selected from calcium chloride, magnesium chloride, aluminum chloride, beryllium chloride, calcium nitrate, magnesium nitrate, aluminum nitrate, beryllium nitrate, and combinations thereof.
 29. The ink receiving system as defined in claim 25 wherein the system is adapted to have indicia formed thereon with black ink having a binder therein, the indicia having substantially increased optical density and substantially decreased drytime.
 30. The ink receiving system as defined in claim 25 wherein the internal sizing agent provides the substrate with a total sizing less than about 70 as measured by a Hercules Sizing Test.
 31. The ink receiving system as defined in claim 25 wherein the system is adapted to have indicia formed thereon with color pigmented ink, the indicia having substantially increased lightfastness and substantially increased color gamut.
 32. The ink receiving system as defined in claim 31 wherein the color pigmented ink includes yellow colorant having a blue wool scale greater than about
 7. 33. The ink receiving system as defined in claim 25, further comprising a surface sizing agent established on the substrate.
 34. The ink receiving system as defined in claim 33 wherein the metallic salt is incorporated with the surface sizing agent.
 35. The ink receiving system as defined in claim 25 wherein the system is adapted for use with an inkjet printer.
 36. A method of making an ink receiving system, the method comprising: incorporating one of an alkyl ketene dimer internal sizing agent and an alkenyl succinic anhydride internal sizing agent into a substrate, wherein the alkyl ketene dimer internal sizing agent is present in an amount ranging from about 2.0 pounds per ton to about 10.0 pounds per ton or the alkenyl succinic anhydride internal sizing agent is present in an amount ranging from about 1.0 pounds per ton to about 4.0 pounds per ton; and incorporating a metallic salt in the substrate.
 37. The method as defined in claim 36 wherein the one of the alkyl ketene dimer internal sizing agent and the alkenyl succinic anhydride internal sizing agent is incorporated into the substrate during a wet end process.
 38. The method as defined in claim 37 wherein the metallic salt is incorporated in the substrate during the wet end process.
 39. The method as defined in claim 36 wherein the metallic salt is incorporated into the substrate during a size press process.
 40. The method as defined in claim 36 wherein the one of the alkyl ketene dimer internal sizing agent and the alkenyl succinic anhydride internal sizing agent, and the metallic salt are substantially simultaneously introduced into the substrate.
 41. The method as defined in claim 36 wherein the one of the alkyl ketene dimer internal sizing agent and the alkenyl succinic anhydride internal sizing agent, and the metallic salt are substantially sequentially introduced into the substrate.
 42. The method as defined in claim 36 wherein the system is adapted to have indicia formed thereon with black pigment ink having a binder therein, the indicia having substantially increased optical density and substantially decreased drytime.
 43. The method as defined in claim 42 wherein the sizing agent provides the substrate with a total sizing less than about 30 as measured by a Hercules Sizing Test.
 44. The method as defined in claim 36 wherein the system is adapted to have indicia formed thereon with color pigmented ink, the indicia having substantially increased lightfastness and substantially increased color gamut.
 45. The method as defined in claim 44 wherein the substrate is selected from paper and photopaper.
 46. A method for using the composition of claim 1, the method comprising incorporating the composition into a substrate, wherein upon preferentially jetting, via an inkjet printer, pigmented color ink on a surface of the substrate to form indicia, a combination of the pigmented color ink and the substrate is adapted to form indicia having substantially increased lightfastness and substantially increased color gamut.
 47. A method for using the composition of claim 1, the method comprising incorporating the composition into a substrate, wherein upon preferentially jetting, via an inkjet printer, black pigment ink having a binder therein on a surface of the substrate to form indicia, a combination of the black pigment ink and the substrate is adapted to form indicia having substantially increased optical density and substantially decreased drytime.
 48. A method for using the composition of claim 14, the method comprising incorporating the composition into a substrate, wherein upon preferentially jetting, via an inkjet printer, pigmented color ink on a surface of the substrate to form indicia, a combination of the pigmented color ink and the substrate is adapted to form indicia having substantially increased lightfastness and substantially increased color gamut.
 49. A method for using the composition of claim 14, the method comprising incorporating the composition into a substrate, wherein upon preferentially jetting, via an inkjet printer, black pigment ink having a binder therein on a surface of the substrate to form indicia, a combination of the black pigment ink and the substrate is adapted to form indicia having substantially increased optical density and substantially decreased drytime.
 50. A composition, comprising: a combination of an alkenyl succinic anhydride sizing agent and an alkyl ketene dimer sizing agent, the sizing agents present in a total amount ranging from about 1.0 lb/ton to about 10.0 lbs/ton; and a metallic salt incorporated into the composition. 